AFS OM120A User Manual - Page 6

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AFS E

UROPE

DVANCED FIBER SOLUTIONS

OM120A Operating instructions

Control Key's: (All key's are rubber key pads)

1. On\Off

2. Backlight

3. Wavelength Select ‫058( ג‬nm, 1300nm, 13l0nm, l490nm and l550nm)

4. dB\dBm\W

5. Zero reference (for all specified wavelengths)

Backlight Key allows the user the option to turn the display backlight on or off.

The Wavelength select key ‫ ג‬allows the user to select between the calibrated wavelengths of the OM120A.

All wavelengths are calibrated to ± 0.2 dB of the NIST standard.

The dB\dBm\W select key allows the user to select between absolute power, which is measured in dBm,

or relative power that is measured is dB. dBm\W is referenced to 1 milliwatt and both are a function of the

log scale.

The Zero reference key when in the dBm mode allows the users to toggle the resolution between 0.0ldB

and 0.ldB

The Zero reference key when in the dB mode allows the user to set the input launch power to a relative

dB zero reference value for easy calculation of loss and attenuation of a fiber Optic cable. For instance, if

a launch cable output power value is -25.6 dBm and a test cable is inserted between the launch cable and

the meter with a reading of -27.1 dBm, the user has to subtract -27.1 dBm from -25.6 dBm to get a result

of -1.5 dB. As simple as this test sounds it can sometimes get confusing to the user due to the fact that

they are not sure if their result should be a positive value or a negative value also miscalculation can be an

issue. The zero reference function eliminates these problems. The user simply sets their reference value

(which in this case is -25.6 dBm) to 0.0 dB then inserts the test cable to get a loss reading of -1.5 dB.

*EASY*.

Different references can be stored for all four wavelengths. The stored reference value will be maintained

until a new reference is stored.

The screen also displays the value that the user has referenced too at the bottom left corner of the screen.

This reading is the dBm (absolute) value of the users dB zero reference value.

* The OM120A also offers an auto power down feature. This function can be enabled or disable when the

unit is powered up by pressing the ‫ ג‬key. When enabled the unit will shut down after 15 minutes of no key

activity. The unit will signal the user that it is about to shut down by counting down the last minute in the

right top corner of the screen.

Email: [email protected]

Tel:

00-31-342-470734

Fax:

00-31-342-422616

Video: 00-31-342-477888

Hunnenweg 7

Terms of payment and

3781 NM Voorthuizen

delivery published at Chamber

Postbus 111

of Commerce Harderwijk

3780 BC Voorthuizen

K.v.K. nr. 08077470

Rabobank

BTW/VAT-number

36.63.12.553

NL121102609B01

Postcheque BEF

Internet

000-1692940-96